Malicious PDF — malware analysis report

Static analysis result for SHA-256 31557886baa8d6b3…

MALICIOUS

PDF

54.0 KB Created: 2020-08-14 13:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6b6ec39b210205a1db5ef9986c2d79 SHA-1: 19d3f311c5b4241c1076161df22cccee0a6f98e3 SHA-256: 31557886baa8d6b3042bcede6a42607030f5c3b069e443aff31c1f5a58cfaed0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure, disguised as an 'Android tutorial video series'. This suggests a phishing or social engineering attempt to direct users to malicious content. The document body, though heavily obfuscated, contains the same lure text and the malicious URL.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=android+tutorial+video+series
    • http://geviluwe.belindarimmer.com/uploads/1/3/0/8/130814328/1673081.pdf
    • http://files.toromewithdino.com/uploads/1/3/0/7/130739387/vupilediwojalej.pdf
    • http://files.204titude.com/uploads/1/3/1/0/131071167/wadimuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/abstract_reasoning_sample_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/vanefejuforetud.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6141/files/xizepajejuramososijoditir.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/83687843560.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/82911168660.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/antihistamnicos_y_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/s10_manual_transmission_identification.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/kawinejimugose.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4732/files/35707085851.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/15727152350.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/rubben_studdard_sorry_2004.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/badunajemojasuganezulok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000965f.bin
60c24db9a4f93292cfaae1093a05a8bf2253ca1b45fbf03c9c295e6f6c200235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965F 4868 bytes
font_01_sfnt_off0000a6f7.bin
82ee3e65f4c826c9b4726ce57a90f0c856d39b2f4d907d41af9cfb314ac1b6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F7 10572 bytes

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